Roland SP-404MK Reference Manual page 180

Appendix MFX List
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Wah
This effect gives a wah-wah sound, by cyclically changing the tone.
Parameter Value
PEAK 0‒100
RATE 0‒100 (when the SYNC parameter is
OFF)
1.000‒0.010 (bars; when the SYNC
parameter is ON)
MANUAL 0‒100
DEPTH 0‒100
FLT TYPE Sets the filter type.
LPF
BPF
SYNC OFF, ON
Explanation
Larger values narrow the frequency range at which the
effect is applied.
Sets the cycle (period) of the effect.
Sets the frequency range in which the effect is applied.
Sets the depth of the effect.
Applies the effect over a wide frequency range.
Applies the effect over a narrow frequency range.
When this is ON, the effect sound synchronizes with the
tempo.